666645077 has 16 divisors (see below), whose sum is σ = 817119360. Its totient is φ = 531116352.

The previous prime is 666645073. The next prime is 666645103. The reversal of 666645077 is 770546666.

It is a cyclic number.

It is not a de Polignac number, because 666645077 - 2² = 666645073 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666645073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40238 + ... + 54335.

It is an arithmetic number, because the mean of its divisors is an integer number (51069960).

Almost surely, 2^666645077 is an apocalyptic number.

It is an amenable number.

666645077 is a deficient number, since it is larger than the sum of its proper divisors (150474283).

666645077 is a wasteful number, since it uses less digits than its factorization.

666645077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94652.

The product of its (nonzero) digits is 1270080, while the sum is 47.

The square root of 666645077 is about 25819.4708892340. The cubic root of 666645077 is about 873.5710344790.

The spelling of 666645077 in words is "six hundred sixty-six million, six hundred forty-five thousand, seventy-seven".